randInt.js #1

var MIN_INT = require('../number/MIN_INT');
var MAX_INT = require('../number/MAX_INT');
var rand = require('./rand');

    /**
     * Gets random integer inside range or snap to min/max values.
     */
    function randInt(min, max){
        min = min == null? MIN_INT : ~~min;
        max = max == null? MAX_INT : ~~max;
        // can't be max + 0.5 otherwise it will round up if `rand`
        // returns `max` causing it to overflow range.
        // -0.5 and + 0.49 are required to avoid bias caused by rounding
        return Math.round( rand(min - 0.5, max + 0.499999999999) );
    }

    module.exports = randInt;